Large companies like RedHat have thousands of candidates, and managing a process like that well is really, really hard. Someone was probably going through a batch of resumes in their internal system and accidentally checked the wrong box.
Your comment is actually a wonderful example why sending unsolicited feedback to candidates is a bad idea. If I take half an hour after a long hard day to write thoughtful feedback for you, I really don't want to deal with "what bullshit is that?/fuck you!/I'll tell everyone I know your company sucks" because I accidentally phrase things poorly or confuse an aspect of your interview with five other interviews I did that day.
Your comment is actually a wonderful example why sending unsolicited feedback to candidates is a bad idea. If I take half an hour after a long hard day to write thoughtful feedback for you, I really don't want to deal with "what bullshit is that?/fuck you!/I'll tell everyone I know your company sucks" because I accidentally phrase things poorly or confuse an aspect of your interview with five other interviews I did that day.